Image forming apparatus with beam splitter and aperture positioned for compactness

Patent metadata

Field	Value
Publication number	US-8970650-B2
Application number	US-201313856878-A
Country	US
Kind code	B2
Filing date	Apr 4, 2013
Priority date	Apr 25, 2012
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

An image forming apparatus is provided that reduces main scanning jitter with a simple configuration and performs light amount control with high accuracy. The image forming apparatus includes: a laser emitting luminous flux; a main-scanning aperture portion shaping the luminous flux; a beam splitter splitting the luminous flux passed through the main-scanning aperture portion into a reflected beam and a transmitted beam; a rotary polygon mirror deflecting the transmitted beam so that the transmitted beam scans the surface of a photosensitive drum; and an optical box in which the laser, the main-scanning aperture portion, the beam splitter and the rotary polygon mirror are disposed. The main-scanning aperture portion is disposed so as not to block a deflected and transmitted beam. The beam splitter abuts against the main-scanning aperture portion so as not to block a deflected and transmitted beam deflected, and is positioned by abutting against the main-scanning aperture portion.

First claim

What is claimed is:

1. An image forming apparatus, comprising:
a light source configured to emit a laser beam;
an aperture configured to shape the laser beam that is emitted from the light source;
a beam splitter configured to split the laser beam, which is shaped by the aperture, into a first laser beam that is a reflected beam and a second laser beam that is a transmitted beam, wherein the beam splitter is positioned by contacting to the aperture, and wherein the first laser…

Assignees

• Canon Kk

Inventors

• Iwamoto Kazuyuki

Classifications

• G03G15/043 Primary

  Physics · mapped topic

• G03G15/0435 Primary

  Physics · mapped topic